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opacify.js
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opacify.js
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// @flow
import rgba from './rgba'
import parseToRgb from './parseToRgb'
import guard from '../internalHelpers/_guard'
import curry from '../internalHelpers/_curry'
/**
* Increases the opacity of a color. Its range for the amount is between 0 to 1.
*
*
* @example
* // Styles as object usage
* const styles = {
* background: opacify(0.1, 'rgba(255, 255, 255, 0.9)');
* background: opacify(0.2, 'hsla(0, 0%, 100%, 0.5)'),
* background: opacify(0.5, 'rgba(255, 0, 0, 0.2)'),
* }
*
* // styled-components usage
* const div = styled.div`
* background: ${opacify(0.1, 'rgba(255, 255, 255, 0.9)')};
* background: ${opacify(0.2, 'hsla(0, 0%, 100%, 0.5)')},
* background: ${opacify(0.5, 'rgba(255, 0, 0, 0.2)')},
* `
*
* // CSS in JS Output
*
* element {
* background: "#fff";
* background: "rgba(255,255,255,0.7)";
* background: "rgba(255,0,0,0.7)";
* }
*/
function opacify(amount: number, color: string) {
const parsedColor = parseToRgb(color)
const alpha: number = typeof parsedColor.alpha === 'number' ? parsedColor.alpha : 1
const colorWithAlpha = {
...parsedColor,
alpha: guard(0, 1, (alpha + amount)),
}
return rgba(colorWithAlpha)
}
export default curry(opacify)